Table 3: List of X-ray associated A-type stars in binary or multiple systems or with hints of hidden companions.
HR Binary v sin (i) Sep. $\delta$ Mag Components Distance Catalog CR $\pm$CR $L_{{\rm x}27}$
104 SB       A3m+F0V 81 R     0.03230 0.01111 281.7
127 B     1.2 A2V+F0-1V 53   P   0.02874 0.0 229.5
196 B   2 10 A2Vs+M2-5V 108 R     0.02738 0.00988 303.1
273 SB       A+A 115 R     0.03753 0.01084 1404.7
325 S 70-100     A3III 72 R     0.03847 0.01332 147.2
328 PB 135-149     A3V 49 R     0.06896 0.01929 143.9
361 B   20/1 1/6 A7IV+F0-1+ 45 R     0.09316 0.01655 158.2
428 S 75-86     A2Vs 87 R     0.02676 0.00829 157.4
499 B   1+13 1.4+0.3 A3V+F0-5 79 R     0.2440 0.03439 1685.7
526 B   2 0.6 A3V+A2-5V+. 102 R     0.03084 0.01243 275.9
575 SB     2.1 A3IV+? 36 R   H 0.08562 0.00733 451.1
579 B   5 3 A5III+ F 111 R     0.01921 0.00677 684.1
707 SB   0.5/1.9   A5pSr 43 R   H 0.04733 0.00328 372.1
803 B   3+50 4+5.5 A3V+G5-8V 108 R     0.02129 0.00961 262.5
804 B   2.7 3.8 A3V+G5-8V 25 R     0.3764 0.04390 219.9
815 B       A3V+K0IV 63 R P H 1.211 0.02160 2771.5
820 B   1.5+30 2+7 A9V+G2-5V 47 R     0.03485 0.00914 74.2
853 B   <1 3.8 A0V+G5V 100 R     0.1296 0.01978 1283.4
884 PB       A2.5V 145 R   H 0.05928 0.00468 3472
971 S 15-23     A1Vs 133 R     0.03695 0.01026 954.9
976 SB   30.8 5.7 A1m 67 R     0.05050 0.01219 215.8
1019 B   4.4 3.8 A0V 162 R     0.02790 0.00945 811.7
1042 PB 136     A1IV 100 R     0.1748 0.03913 2452.1
1189 B   7 0.6 A1V+G2-5V 49 R P H 0.02961 0.00328 134.7
1211 SB   7/165 1.4/7 A2V 106 R   H 0.1305 0.00553 2448.8
1324 B       A2V 98 R     0.4692 0.03117 4978.2
1330 PB 138-152     A7V 79 R     0.3023 0.02542 1872.0
1341 PB 35-44     A0pSi 97 R     0.1606 0.02224 1288.9
1342 S 130-145     A3V 95 R     0.02325 0.00856 322.7
1368 SB       A3m 46 R P   0.02448 0.0 32.6
1376 SB       A1m 47 R     0.02222 0.00919 38.6
1380 SB       A7V 45 R     0.03143 0.00932 101.1
1389 B   1.3/63 3.3/4.5 A2IV 45 R   H 0.01973 0.00188 51.7
1412 SB       A7III 46   P   0.02410 0.0 361.1
1438 B   30 3 A2V 123 R     0.05492 0.02248 532.2
1458 SB       A5m 46 R   H 0.05959 0.00385 632.5
1466 B   0.3/0.8 0.8/1.6 A8V 85 R   H 0.01630 0.00179 524.6
1473 SB       A6V 46 R     0.02527 0.01011 46.0
1490 B   43 5 A2V 103 R     0.09877 0.01624 975.0
1501 PB 73-85     A8V 72 R     0.02963 0.00966 144.8
1511 B   <1 4 A3m 50 R     0.02433 0.00904 40.6
1522 PB 120-132     A2V 85   P   0.00677 0.0 35.1
1530 PB       A8/A9III/IV 68   P   0.0 0.0 1
1568 SB   <1 3.4 A1V 115 R     0.1428 0.02016 2088.7
1592 B   4.5 3 A1V+G0-2V 49 R   H 0.1872 0.01070 1656.2
1639 B   0.3 2.9 A5V+G2-5V 82 R     0.02810 0.00931 170.2
1664 B   0.7 0.8 Am+A5-F0V 59 R     0.03835 0.01250 73.5
1666 B 177-200     A3III 27 R     0.1763 0.02362 --
1670 B 30-87 11.8 2.7 A5m+M2V 55 R     0.03316 0.00977 109.8
1734 B 111-124 4.1 6 A7V+K5-M0V 72 R P   0.02300 0.00181 109.8
1857 B   1.5 3.5 A0V+G0V 114 R     0.04920 0.01299 667.1
1872 PB 140-154     A2V 106 R     0.03153 0.00994 364.1
1971 PB 21-29     A2VpCr 148   P   0.0 0.0 2
2015 S 172-225     A7V 44   P H 0.00609 0.00139 3.6
2020 S 104-130     A5V 19     H 0.00131 0.00031 1.4
2088 B 32-41 12.6 12.2 A2IV 25     H 0.01018 0.00186 18.5
2095 B   2.2/ 4.5/ A0pSi+F2-5V 53 R     0.1186 0.01951 94.9
2124 SB       A2V 47 R P H 0.1245 0.00359 180.3
2181 B 248 0.1 0.1 A0V+A 80 R     0.02450 0.00744 184.3
2238 PB 35-47     A2Vs 46 R     0.01886 0.00877 35.1
2253 B   2.3/25.4 5.3/7 A3V+G2-5V 195 R     0.02084 0.00915 1292.0
2280 B   0.4 0.5 A4.5V 102 R     0.03662 0.01048 411.2
2298 SB   14/93.6 2.3/8.3 A5IV 39 R   H 0.01297 0.00426 85.7
2320 PB       Am 50 R     0.01822 0.00451 42.9
2328 B 220-238 21.1 2.4 A0Vn 125 R     0.1372 0.01845 2640.5
2421 SB       A0IV 32 R   H 0.06328 0.00555 220.5
2424 B   1.5/21.5 0.8/5.5 A0V+A0V 178 R   H 0.02561 0.00201 2209.4
2466 PB 90-102 0.0055 2.4 A2V 43 R     0.09255 0.01812 125.0
2482 B   8 1.5 A3V 91 R     0.04727 0.01076 259.1
2491 SB       A1V 3 R   H 2.584 0.02469 66.7
2550 PB 206     A7IV 30 R P   0.08366 0.00296 65.2
2626 SB       A0V 130 R     0.01559 0.00698 191.3
2890 SB       A2Vm 16 R   H 0.3086 0.00202 830.4
2891 SB       A1V 16 R   H 0.3086 0.00202 226.8
2950 B   0.9   A0III --   P   0.00514 0.00164 --
3173 B   45.6/7.3 8/0.5 A2V+M0V 67 R     0.02640 0.01003 104.6
3221 B   2.8/48.6/+ 3.2/... A7Vm 153 R     0.01983 0.00991 340.9
3260 B   3.6 2.6 A2V+F2V 74 R     0.09536 0.01760 535.5
3314 S 115-161     A0V 38     H 0.00639 0.00157 27
3337 SB   0.17   A5m 85 R   H 0.03410 0.00463 1172.2
3352 SB   1.8 3.3 A2m 84 R     0.05309 0.01266 328.3
3410 SB       A1Vnn 55 R     0.1015 0.02102 218.9
3455 B   3.8 2 A3V 70 R     0.5313 0.05003 2994.4
3460 B   21.4 9.8 A0V 73 R     0.03332 0.01167 214.3
3485 B   0.6/2.6 /3 A1V 24 R   H 0.1047 0.00888 134.0
3524 B       A8V+A8V 98 R   H 0.01935 0.00161 2985.0
3569 SB   10.7   A7IV 15 R   H 0.04752 0.00520 28.2
3586 B 170-186 0.53 3.2 A9Vn 66   P   0.01903 0.0 587.4
3655 B       A3III+A0V 83 R     0.03523 0.01223 271.2
3685 S 145-167     A2IV 34     H 0.00781 0.00090 26.1
3690 SB       A3V 37 R     0.2099 0.02384 206.2
3699 PB 10     A8Ib 212 R     0.05838 0.01893 464.6
3756 B   0.1 0.1 A5III/IV 115 R     0.06428 0.01169 930.5
4065 B 183 2 0.1 A1V 89 R     0.06759 0.01836 574.6
4096 B   1.7 4 A2V 66 R     0.03358 0.01125 131.3
4203 PB   200   A1Vn 116 R     0.02432 0.01012 278.2
4228 S       A0Ia --   P   0.03660 0.00399 --
4229 B   1.9 0.6 A2IV 96 R     0.03664 0.01580 300.4
4237 B   27.3 5.8 A3m 112     H 0.00438 0.00072 158.8
4296 B   10.6 7.3 A3III-IV 60   P   0.01840 0.0 46.3
4309 B   8.2 5.6 A3III-IV 81     H 0.00536 0.00059 100
4343 B 40-49     A1V+WD 82 R     0.4689 0.04332 2262.8
4350 S       A3IV-V 50 R     0.07834 0.02435 204.1
4380 SB       A2V+A1V 56 R     0.05317 0.01638 122.8
4385 B   <1 3.4 A8IIIm 65 R     0.02670 0.00774 78.5
4405 B   5.2 3.8 A9V 26 R P   0.02455 0.0 13.1
4422 SB   5.5   A2V 64 R     0.05441 0.01684 195.6
4454 B   <1 2.8 A2m+F8-G0 114 R     0.05492 0.01434 565.5
4528 B   0.3   A1 59 R     0.01922 0.00858 84.9
4535 SB       A3m 63 R     0.02716 0.01110 119.9
4574 B   7.4 6.1 A9V 47     H 0.00499 0.00234 32.2
4599 SB   4.5 9.5 Am 70 R     0.02888 0.01095 81.4
4646 SB       A5m 34 R     0.2709 0.05984 274.2
4703 B   32 5.7 A5V+G8-K0V 103   P   0.01230 0.00384 93.7
4717 PB       A3V 87   P   0.00576 0.00088 31.7
4791 SB   20.3 1.5 A3III-IV 806     H 0.00078 0.00047 --
4796 B   6.9 7.5 A0V 67 R P H 0.1107 0.00457 428.4
4855 S   139 3.2 A3V 75 R P   0.1126 0.0 281.5
4892 SB   22   A0V+A2V+HR4893 68 R     0.01271 0.00541 42.3
4915 SB   20   A0pSiEuHg 34 R     0.07636 0.01479 62.6
4921 B   0.1/20.9 /4.3 A3V 91   P   0.02245 0.0 133.4
5037 PB 205-222     A2V 65 R P   0.2937 0.00919 1149.8
5054 SB       A2V 24 R P   0.02818 0.00269 8.6
5055 SB       A1m -- R P   0.02172 0.00259 --
5144 B   4.8 3 A1V 93 R   H 0.03321 0.00324 869.5
5234 B   1.5/27.9 0.8/6.4 A1V 143   P   0.04743 0.00848 1127.4
5269 S       ApSi 169     H 0.00088 0.00045 72
5291 SB       A0III 95 R     0.04237 0.00972 274.4
5350 SB       A9V 30 R     0.05820 0.01190 36.0
5360 S       A2IV 102     H 0.00797 0.00254 236.3
5386 B   6.1/ 1.7/0.3 A0V+F0V+F2V 66 R     0.08158 0.01807 273.5
5401 B   26.9 5.7 Am 58 R     0.02251 0.01012 48.8
5413 SB   22 5.5 A1V 68 R   H 0.01965 0.00095 690.3
5433 B   2 9.8 A7Vn 71 R     0.04928 0.01152 245.3
5663 B   13.3 4.4 A3m 52 R     0.01862 0.00857 30.9
5697 B   5.7 2.2 A0pSi+F5-8V 123 R   H 0.03590 0.00405 2409.4
5719 B   1.4 5.5 A0pSi 118 R P   0.05763 0.0 1601.4
5756 SB   11 2.7 A2V 73 R     0.02947 0.01199 112.7
5765 B   9.2/? 1.2/1.4 A4V 102 R     0.07019 0.01404 1160.5
5793 B       A0V+G5V 23 R P H 0.1324 0.00681 51.5
5818 B   ? ? A2V 76 R P   0.06149 0.00519 443.6
5846 B   3.7 1.8 A0V+B 141 R     0.1035 0.01961 2006.2
5887 SB   1.3 3 A3m 80 R     0.01645 0.00533 78.3
5895 B 185-229 0.1   A3Vn 49 R P   0.04194 0.0 50.9
5961 B   0.2/10 0.5/2.4 A7IV 43 R   H 0.4617 0.01690 3566.3
5983 SB       A2III+G8 212 R     0.03313 0.01155 1066.8
5999 3 SB       A7IVe 208 R P H 0.2870 0.01450 20422.5
6000 B   1.3 4.6 A1III 241 R P H 0.1892 0.00595 3902.4
6097 B   6.2 0.4 A0V+A0V 117 R     0.07391 0.01681 1009.1
6111 SB       A1III+M 105 R     0.02651 0.01026 473.1
6123 B   0.2   A5V 79 R     0.01403 0.00557 123.1
6129 SB   0.8 3.2 A3m 37 R     0.2882 0.02920 372.0
6162 B   16.3 3.3 A4Vn 69 R     0.04089 0.00916 155.2
6186 B   3.7 1 A1Vnn 122 R     0.07209 0.01542 418.2
6216 B   1.9/24 3.5/7.4 A2V 92 R     0.03966 0.01394 208.8
6218 B   5.4 7.6 A3IV 231 R     0.01908 0.00957 1438.3
6240 SB       A7+F6 74 R P H 0.4669 0.00742 1344.3
6254 B   1.8/ 5.5/ A2VpSrCrEu 54 R   H 0.01402 0.00263 90.7
6317 SB   0.1   A7V 73 R     0.01663 0.00700 144.2
6377 B   0.08/19.5 0/6 A5m 54 R     0.02051 0.00739 42.9
6435 B 210-228 1.6/11.5 1/4.9 A0V(nn) 114 R   H 0.04231 0.00238 1390.6
6436 SB   0.9   A2V 55 R P   0.03320 0.0 92.5
6554 SB   60   A6V 30 R     0.01433 0.00427 9.7
6555 SB       A4m 31 R     0.01433 0.00427 9.9
6556 PB       A5III 14 R     0.1241 0.01652 18.3
6618 PB 130-170     A2V 127 R     0.00979 0.00324 207.7
6641 SB   0.1   A2Vs 132 R     0.08195 0.00874 1661.5
6656 B       A2V 67 R     0.00915 0.00344 65.6
6730 B   6.1 0.2 A5IIIn 144 R     0.1143 0.01617 1680.3
6771 SB   25.3/51.7 10.3/7.3 A4IVs 25 R     0.02134 0.00982 8.6
6781 B   0.1/14.2   A3V 70 R   H 0.09434 0.00861 2239.4
6825 PB 25-33     ApSi 1205 R     0.05331 0.01705 -
6843 B   0.7 3.5 A8V 132 R     0.1390 0.02396 3939.3
6876 SB       A5m 58 R     0.04933 0.01029 145.0
6923 SB       A1V 58 R P H 0.06139 0.00518 373.0
6956 B   <0.1   A4-5IV/V 74 R     0.04510 0.01560 248.8
7001 B   43/46 9.5/11 A0Va 8     H 0.1125 0.00514 19.4
7051 B   3.4 0.9 A4V 50 R P H 0.07280 0.00424 189.1
7056 SB       A4m 47 R     0.2511 0.02232 571.6
7077 B   0.2   A1m 128 R     0.02421 0.01161 649.4
7124 SB       A1Vn 93 R     0.02501 0.00495 203.5
7160 S       A8V 88 R P H 0.04693 0.00536 243.4
7214 PB       A4V 55 R     0.07833 0.01560 255.2
7215 B   41.9 5.6 A7V 39 R     0.07750 0.01322 105.3
7235 SB       A0Vn 26 R   H 0.05526 0.00451 84.9
7313 PB 195-212     A1Vn 84 R     0.04254 0.01231 255.3
7392 SB       Am 57 R     0.03887 0.01431 122.3
7431 SB       A1mA2-F0 89 R   H 0.01046 0.00326 134.9
7557 S       A7V 5 R P   0.1785 0.00357 6.4
7562 B   0.4 3.3 A1m 117 R P   0.0264 0.0 370.2
7571 B   0.15   A1V+F8IV 117 R     0.3836 0.04335 6865.9
7610 SB       A1IV 63 R P   0.03413 0.0 122.1
7695 B   4.9/150 3-4/5 A2II-III+ 78 R     0.02284 0.00550 101
7755 B   0.2   A2Vn 109 R     0.00606 0.00297 52.6
7775 SB       B9.5III/IV 96 R     0.02685 0.01216 177.6
7781 SB   3   A2Vs 89 R     0.03763 0.00656 291.8
7917 SB   1.2 3 A2V 82 R     0.01681 0.00727 128.0
8021 SB       A7III+G2III 45 R     1.024 0.07911 1802
8028 B   0.2   A1Vne 109 R     0.04808 0.01015 788.3
8060 B   0.3 1.3 A5V 48 R     0.04937 0.01884 188.4
8101 B   17.9 1 A1V 621 R     0.06809 0.01332 --
8140 B   3 2.5 A5V+G0V 30 R   H 0.1034 0.00936 341.3
8151 B   0.15 2.5 A2pCrEuSr+ 57 R     0.1062 0.01907 411.2
8162 B   209.2 8 A7IV 15 R P   0.02026 0.00278 7.1
8210 SB       A8Vm+WD 46 R     1.052 0.06780 3631.1
8263 B   31.3 3.3 A2V 122 R     0.02600 0.01072 322.3
8266 PB 185-201     A5V 63 R     0.01405 0.00626 36.6
8307 B   1.4/ 5.4/ A0V 84   P   0.05806 0.00468 4326.6
8322 B       Am 12 R     1.655 0.12550 187.5
8396 SB       A2V+K0III 145 R   H 0.03348 0.00316 505.2
8417 SB       A3m 31 R   H 0.05639 0.00470 169.7
8431 PB       A2V 40 R     0.03442 0.01345 89.6
8518 SB       A0V 48 R     0.05508 0.01707 92.9
8533 B   0.5/ 0.2/ A0V 130 R P   0.01041 0.0 448.2
8576 B   30.3 2 A0V 45 R     0.06447 0.01814 88.5
8598 B   9.5/ 3/ A0V 123 R     0.01753 0.00758 104.9
8600 PB       A3Vn 69 R     0.03796 0.01648 169.9
8662 SB       A9IIIm 74 R   H 0.00376 0.00108 14.8
8724 B   3.9 2.9 A3Vs 82 R     0.04692 0.01266 337.9
8738 S       A1V 96   P   0.01433 0.00 90.2
8799 S       A5V 40 R     0.02123 0.00783 14.7
8865 B   1.2 4 A0V 76 R   H 0.07713 0.00658 834.0
8884 B   13.2 3.5 A5Vn 80 R     0.01986 0.00827 121.2
8963 B   27.7 6.2 A1Vn 73     H 0.00203 0.00086 31.3
9016 B   3.3/ 7/ A0V 44 R P H 0.1724 0.00813 379.4
9039 PB 156-180     A4Vn 58 R     0.03021 0.01058 99.6
1 Simon et al. (1995) calculate an $L_{\rm x}$ of 33 $\times$ 1027 erg/s from PSPC pointing observations. The Second ROSAT Source Catalog of Pointed Observation (2001) lists false detections in the field and therefor no count rate for the source.
2 In The Second ROSAT Source Catalog of Pointed Observation (2001) this source is flagged as suspect in lightcurve, variability and spectrum. No count rate for the source is listed.
3 See Zinnecker & Preibisch (1994) and Hamaguchi et al. (2005).

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